Unexpected rapid decrease in phase velocity of submeter Farley-Buneman waves with altitude

Details Unexpected rapid decrease in phase velocity of submeter Farley-Buneman waves with altitude Unexpected rapid decrease in phase velocity of submeter Farley-Buneman waves with altitude

Feb 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3503106k&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 3, CiteID L03106

Physics

1

Ionosphere: Ionospheric Irregularities, Ionosphere: Equatorial Ionosphere, Ionosphere: Plasma Waves And Instabilities (2772), Radio Science: Ionospheric Physics (1240, 2400), Radio Science: Remote Sensing

Scientific paper

An unexpected and drastic drop in the phase velocity V ph of Farley-Buneman (FB) waves with increasing altitude was observed in the equatorial electrojet over Jicamarca. The effect was detected with the newly employed 430-MHz radar looking vertically. The decrease in V ph was 67 m/s and 36 m/s over 2.4 km for the FB waves moving towards and away from the radar, respectively. By contrast, the 430-MHz data from 20° west displayed little dependence on altitude. Simultaneous observations with a 50-MHz radar at 23° and 51° west also displayed little change of V ph with altitude. We show that electron inelastic cooling which defines gradual transition from super-adiabatic to isothermal processes at 50 MHz (used in majority of observations), becomes unimportant at higher frequencies. The effect is evinced at radar frequencies >=150 MHz and requires altitude resolution <2 km to be observed. Averaging over >7 km at oblique incidence masks the effect.

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